Hi Guys, need your help here. i got the following problem not only with one but with two 105.012 When i unscrew the caseback start and stop on the upper pusher and reset on the lower pusher work perfectly. But as soon as i tighten the caseback and pressure is applied to the dust cover, the upper pusher starts and RESETS because the pin for the lower button gets stuck somehow. I can also simulate it by pressing down the dust cover with my fingers. Same malfunction occurs. Hope you can help me out here.